[FIX] website: restore overlay for timeline cards edition

With [1], not all overlays are displayed anymore but we rather show the
parent one in some cases. The timeline cards were considered as one of
those cases while it should not, as it prevents to use the overlay
buttons allowing to switch the cards order.

[1]: https://github.com/odoo/odoo/commit/9bbe5be3fb0d995374a369851df3641979d8e553

Discovered while working on task-2431484

closes odoo/odoo#73515

X-original-commit: 26708e168c717ae7e3a29c7705c80679b8e45f7d
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/snippets/s_timeline/options.js

@@ -4,6 +4,8 @@ odoo.define('website.s_timeline_options', function (require) {
 const options = require('web_editor.snippets.options');
 
 options.registry.Timeline = options.Class.extend({
+    displayOverlayOptions: true,
+
     /**
      * @override
      */